springboot项目启动成功后执行一段代码的两种方式

实现ApplicationRunner接口

package com.lnjecit.lifecycle;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

/**
 * @author lnj
 * createTime 2018-11-07 22:37
 **/
@Component
public class ApplicationRunnerImpl implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println("通过实现ApplicationRunner接口，在spring boot项目启动后打印参数");
        String[] sourceArgs = args.getSourceArgs();
        for (String arg : sourceArgs) {
            System.out.print(arg + " ");
        }
        System.out.println();
    }
}

项目启动后，会打印如下信息：

实现CommandLineRunner接口

package com.lnjecit.lifecycle;

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

/**
 * @author lnj
 * createTime 2018-11-07 22:25
 **/
@Component
public class CommandLineRunnerImpl implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("通过实现CommandLineRunner接口，在spring boot项目启动后打印参数");
        for (String arg : args) {
            System.out.print(arg + " ");
        }
        System.out.println();
    }
}

两种实现方式的不同之处在于run方法中接收的参数类型不一样

指定执行顺序

当项目中同时实现了ApplicationRunner和CommondLineRunner接口时，可使用Order注解或实现Ordered接口来指定执行顺序，值越小越先执行

案例地址

https://github.com/linj6/springboot-learn/tree/master/springboot-runner

参考资料

https://blog.csdn.net/zknxx/article/details/52196427

原文地址：https://www.cnblogs.com/zuidongfeng/p/9926471.html